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Egee 102 you are redecorating your living room. and the interior designer recommends 50 footcandles illumination. your living room measures 6 ft by 12 ft. how many 40 watt bulbs will be required if one bulb emits 515 lumens. (1 footcandle = 1 lumen/sq.ft)

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carlosego
The area of the room is given by:
 A = (6) * (12)
 A = 72 feet ^ 2
 For each 40 watt bulb we have:
 (515) / 72 = 7.152777778 footcandle
 The number of 40 watt bulbs is:
 N = (50) / (7.152777778)
 N = 7, 40 watt bulbs
 Answer:
 will be required about:
 N = 7, 40 watt bulbs

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